CN2567863Y - Electromagneitc compatible filter circuit of frequency conversion air conditioner - Google Patents
Electromagneitc compatible filter circuit of frequency conversion air conditioner Download PDFInfo
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- CN2567863Y CN2567863Y CN 02207608 CN02207608U CN2567863Y CN 2567863 Y CN2567863 Y CN 2567863Y CN 02207608 CN02207608 CN 02207608 CN 02207608 U CN02207608 U CN 02207608U CN 2567863 Y CN2567863 Y CN 2567863Y
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Abstract
The utility model provides an electromagnetic compatible (EMC) filter circuit of a frequency conversion air conditioner. An air conditioner comprises a transformer used for transforming an AC input power supply to a DC power supply, an inverter used for transforming the DC power supply transformed by the transformer to an AC power supply used for driving a compressor to rotate, and a converting circuit between the transformer and the inverter. The utility model is characterized in that the utility model also comprises a multilevel EMI filter circuit formed by that two levels or more than two levels of power supply EMI wave filters are connected, and the multilevel EMI filter circuit is arranged between the AC input power supply and the transformer. By using the EMC filter circuit of the utility model, the electromagnetic molestation of various components in the circuit can be effectively restrained, and the requirement of the EMC index can be completely met. The utility model has the advantages of simple circuit structure and low development cost; the utility model can be directly applied to the existing frequency conversion air conditioner.
Description
Technical field
The utility model relates to transducer air conditioning, especially relates to the electromagnetic disturbance (EMI) that suppresses in the transducer air conditioning to satisfy the EMC filter circuit of Electromagnetic Compatibility index.
Technical background
Transducer air conditioning is meant and can regulates the operating frequency of compressor automatically according to the variation of ambient temperature, thus the air conditioner of control room temperature.In the circuit of transducer air conditioning, the AC alternating current that converter will exchange the input of (AC) power supply converts direct current (DC) to, controller determines that according to the variation of ambient temperature the operating frequency of compressor is to determine the drive signal of inverter, inverter becomes the AC electric current according to the drive signal of controller output with the DC current conversion that converter is transformed into, thereby drives compressor operating.
Because the use of inverter and converter has produced very big electromagnetic disturbance in circuit in the transducer air conditioning, therefore, must suppress electromagnetic disturbance (EMI) in the transducer air conditioning to satisfy the Electromagnetic Compatibility index.The EMC filter circuit includes power filter and passive filter circuit.The design complexity of active filter circuit, the cost height, the construction cycle is long.Traditional passive filter circuit as shown in Figure 1, its circuit structure is simple, but is difficult to reach the EMC index.
Technology contents
The purpose of this utility model is that the passive filter circuit that solves existing transducer air conditioning is difficult to reach the problem of EMC index, and provides a kind of circuit simple, and is with low cost, can satisfy the passive filter circuit of transducer air conditioning EMC index.
To achieve these goals, the utility model adopts following technical scheme according to the principle of multiple-stage filtering: a kind of electromagnetic compatibility of transducer air conditioning (EMC) filter circuit, and described air conditioner comprises: converter is used for ac-input power supply is transformed into the DC power supply; Inverter is used for the DC power conversion that forms through the converter conversion is become to be used to drive the AC power supplies that compressor rotates; And the intermediate conversion circuit between converter and the inverter, it is characterized in that, also comprise the multistage EMI filter circuit that is connected and is formed by two-stage or the power supply electromagnetic interface filter more than the two-stage, described multistage EMI filter circuit is arranged between ac-input power supply and the converter.
In circuit of the present utility model, owing to be provided with multistage electromagnetic disturbance (EMI) filter circuit, can effectively suppress, thereby satisfy the requirement of EMC index fully the electromagnetic disturbance of the various compositions in the circuit.Circuit structure of the present utility model is simple, and development cost is low, can directly apply to existing transducer air conditioning, has good social benefit and economic benefit.
Description of drawings
Fig. 1 is the circuit connection diagram of traditional passive filter circuit;
Fig. 2 is the theory diagram of electromagnetic compatibility filter circuit under the small-power situation of the utility model transducer air conditioning;
Fig. 3 is the concrete connecting circuit figure of embodiment one of the electromagnetic compatibility filter circuit of the utility model transducer air conditioning;
Fig. 4 is the concrete connecting circuit figure of embodiment two of the electromagnetic compatibility filter circuit of the utility model transducer air conditioning;
Fig. 5 uses the EMC conduction figure of existing passive filter circuit for the transducer air conditioning of certain model;
Fig. 6 uses the EMC conduction figure of electromagnetic compatibility filter circuit of the present invention for the transducer air conditioning of same model;
Fig. 7 is the theory diagram of electromagnetic compatibility filter circuit under high-power situation of the utility model transducer air conditioning;
Fig. 8 is the concrete connecting circuit figure of embodiment three of the electromagnetic compatibility filter circuit of the utility model transducer air conditioning;
Fig. 9 is the concrete connecting circuit figure of embodiment four of the electromagnetic compatibility filter circuit of the utility model transducer air conditioning.
Preferred forms
As shown in Figure 2, according to the EMC standard code, for the low power frequency conversion air conditioner of rated operational current less than 16A, its harmonic wave suppresses to reach certain requirement.Therefore, under the small-power situation, the electromagnetic compatibility filter circuit comprises that the continuous harmonic wave of order that is arranged between ac-input power supply and the converter suppresses circuit 110 and multistage EMI filter circuit 120.
Be the concrete connecting circuit of embodiment one as shown in Figure 3.In the present embodiment, converter is a rectifier bridge, and multistage EMI filter circuit 120 comprises first order power supply electromagnetic interface filter 121 and the second level power supply electromagnetic interface filter 122 that is linked in sequence.
Wherein, two of AC power supplies input L-AC and N-AC connect two inputs that harmonic wave suppresses circuit 110 through magnet ring L1 respectively.Harmonic wave inhibition circuit 110 is joined principle by inductance L 2 and electrodeless electric capacity C1 according to difference and is formed by connecting, and inductance L 2 is connected on the live wire, and capacitor C 1 is connected in parallel on after the inductance L 2, to suppress the harmonic components in the circuit.Harmonic wave suppresses the input of the output termination first order power supply electromagnetic interface filter 121 of circuit 110.
The power supply electromagnetic interface filter mainly comprises common mode choke, as required, can also comprise X electric capacity and/or two Y electric capacity.Common mode choke and X electric capacity constitute a low pass filter between the L-N separate port, to suppress differential mode harassing and wrecking signal; Common mode choke and Y electric capacity constitute the low pass filter between L-E and two pairs of separate ports of L-N respectively, to suppress common mode harassing and wrecking signal.
First order power supply electromagnetic interface filter 121 is by common mode choke L3, and X capacitor C 3 and two Y capacitor C 4, C5 and parallel resistance R1 form.The input of the output termination second level power supply electromagnetic interface filter 122 of first order power supply electromagnetic interface filter 121.
Second level power supply electromagnetic interface filter 122 is by common mode choke L4, and X capacitor C 12, two Y capacitor C 6, C7 form.The input of the output termination rectifier bridge of second level power supply electromagnetic interface filter 122.
The input of the output termination intermediate conversion circuit 130 of rectifier bridge.Be with the difference of existing intermediate conversion circuit, in the present embodiment, in the output parallel connection of rectifier bridge an electrochemical capacitor, and the diode of having connected between the output of rectifier bridge and intermediate conversion circuit inductance L5 plays energy snubber and harmonic wave and isolates.Two inputs of the output termination inverter of intermediate conversion circuit 130.
According to the conducting effect of EMC, can also connect a Y capacitor C 11 at the negative pole end of rectifier bridge.
Be the concrete connecting circuit of embodiment two as shown in Figure 4.Be with the difference of embodiment one, in the power supply electromagnetic interface filter of the second level,, can not use X electric capacity, thereby reduce cost according to the EMC conducting effect.
In the intermediate conversion circuit, the diode of having connected between the output of rectifier bridge and intermediate conversion circuit inductance L5 is parallel with a capacitor C 8 on the branch road that described diode and inductance L 5 are in series.
The transducer air conditioning that is illustrated in figure 5 as certain model uses the EMC conduction figure of existing passive filter circuit.As seen, its low frequency part below 5MHz can not reach the requirement of EMC standard.Use the EMC conduction figure of electromagnetic compatibility filter circuit of the present invention for the transducer air conditioning of same model as Fig. 6.As seen, it all can satisfy the requirement of EMC standard on all frequency bands.
According to the EMC standard code, do not do requirement greater than the harmonic wave inhibition of the high-power frequency conversion air conditioner of 16A for rated operational current.Therefore, as shown in Figure 7, under high-power situation, do not need harmonic wave to suppress circuit in the electromagnetic compatibility filter circuit of the present utility model, the electromagnetic compatibility filter circuit comprises the multistage EMI filter circuit 220 that is arranged between ac-input power supply and the converter, and is arranged on the intermediate conversion circuit 230 between converter and the inverter.
Be the concrete connecting circuit of embodiment three as shown in Figure 8.In the present embodiment, converter is a rectifier bridge, and multistage EMI filter circuit 220 comprises first order power supply electromagnetic interface filter and second level power supply electromagnetic interface filter.
Be the concrete connecting circuit of embodiment four as shown in Figure 9.In the present embodiment, multistage EMI filter circuit 220 comprises the three stage power source electromagnetic interface filter, the output of first order power supply electromagnetic interface filter forms two in parallel branch roads, each branch road connect respectively a second level power supply electromagnetic interface filter and a third level power supply electromagnetic interface filter.Present embodiment is applicable to the transducer air conditioning that has two inverters, drags four, one to drag six etc. one transducer air conditionings that drag multi-series as one drag two.
EMC filter circuit of the present utility model not only can be applied to transducer air conditioning, can also be applied to the electronic equipment that other use inverter.
Claims (10)
1, a kind of electromagnetic compatibility of transducer air conditioning (EMC) filter circuit, described air conditioner comprises: converter is used for ac-input power supply is transformed into the DC power supply; Inverter is used for the DC power conversion that forms through the converter conversion is become to be used to drive the AC power supplies that compressor rotates; And the intermediate conversion circuit between converter and the inverter, it is characterized in that, also comprise the multistage EMI filter circuit that is connected and is formed by two-stage or the power supply electromagnetic interface filter more than the two-stage, described multistage EMI filter circuit is arranged between ac-input power supply and the converter.
2, EMC filter circuit according to claim 1 is characterized in that: also be provided with harmonic wave and suppress circuit before described multistage EMI filter circuit.
3, EMC filter circuit according to claim 2, it is characterized in that: described harmonic wave inhibition circuit is joined principle by inductance (L2) and electrodeless electric capacity (C1) according to difference and is formed by connecting, described inductance (L2) is connected on the live wire, and described electric capacity (C1) is connected in parallel on inductance (L2) afterwards.
4, EMC filter circuit according to claim 1 and 2, it is characterized in that: described converter is a rectifier bridge, in described intermediate conversion circuit, in the output parallel connection of rectifier bridge an electrochemical capacitor, and the diode of between the output of rectifier bridge and intermediate conversion circuit inductance (L5), having connected.
5, EMC filter circuit according to claim 1 and 2, it is characterized in that: described converter is a rectifier bridge, in described intermediate conversion circuit, the diode of having connected between the output of rectifier bridge and intermediate conversion circuit inductance (L5) is parallel with an electric capacity (C8) on the branch road that described diode and intermediate conversion circuit inductance (L5) are in series.
6, EMC filter circuit according to claim 1 and 2 is characterized in that: described converter is a rectifier bridge, can also connect a Y electric capacity (C11) at the negative pole end of described rectifier bridge.
7, EMC filter circuit according to claim 1 and 2 is characterized in that: described power supply electromagnetic interface filter includes common mode choke.
8, EMC filter circuit according to claim 7 is characterized in that: described power supply electromagnetic interface filter also comprises X electric capacity.
9, EMC filter circuit according to claim 7 is characterized in that: described power supply electromagnetic interface filter also comprises two Y electric capacity.
10, EMC filter circuit according to claim 1 and 2, it is characterized in that: described multistage EMI filter circuit comprises the three stage power source electromagnetic interface filter, the output of first order power supply electromagnetic interface filter forms two in parallel branch roads, each branch road connect respectively a second level power supply electromagnetic interface filter and a third level power supply electromagnetic interface filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02207608 CN2567863Y (en) | 2002-03-08 | 2002-03-08 | Electromagneitc compatible filter circuit of frequency conversion air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02207608 CN2567863Y (en) | 2002-03-08 | 2002-03-08 | Electromagneitc compatible filter circuit of frequency conversion air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2567863Y true CN2567863Y (en) | 2003-08-20 |
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ID=33688539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02207608 Expired - Lifetime CN2567863Y (en) | 2002-03-08 | 2002-03-08 | Electromagneitc compatible filter circuit of frequency conversion air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2567863Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100435481C (en) * | 2004-01-08 | 2008-11-19 | 深圳市三叶照明科技有限公司 | Electromagnetic compatible filter network and filter network module |
| CN101577484B (en) * | 2008-05-08 | 2011-11-16 | 海尔集团公司 | Power supply device of switch power supply of external convertible frequency air conditioner |
| CN101523684B (en) * | 2005-09-02 | 2012-04-04 | 通用汽车环球科技运作公司 | Snap in high power, high current connector with integrated emi filtering |
| CN104638907A (en) * | 2015-02-11 | 2015-05-20 | 深圳市振邦智能科技有限公司 | Circuit for improving EMI (Electro Magnetic Interference) of refrigerator with inverter |
| CN110336458A (en) * | 2019-05-10 | 2019-10-15 | 珠海格力电器股份有限公司 | Harmonic wave control circuit, power supply with the circuit and air conditioner |
-
2002
- 2002-03-08 CN CN 02207608 patent/CN2567863Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100435481C (en) * | 2004-01-08 | 2008-11-19 | 深圳市三叶照明科技有限公司 | Electromagnetic compatible filter network and filter network module |
| CN101523684B (en) * | 2005-09-02 | 2012-04-04 | 通用汽车环球科技运作公司 | Snap in high power, high current connector with integrated emi filtering |
| CN101577484B (en) * | 2008-05-08 | 2011-11-16 | 海尔集团公司 | Power supply device of switch power supply of external convertible frequency air conditioner |
| CN104638907A (en) * | 2015-02-11 | 2015-05-20 | 深圳市振邦智能科技有限公司 | Circuit for improving EMI (Electro Magnetic Interference) of refrigerator with inverter |
| CN110336458A (en) * | 2019-05-10 | 2019-10-15 | 珠海格力电器股份有限公司 | Harmonic wave control circuit, power supply with the circuit and air conditioner |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20120308 Granted publication date: 20030820 |